Butterfly valve mainly by the body, disc, stem, seals and transmission components.

(1) Butterfly valve  body:Cylindrical body, upper and lower parts each have a cylindrical projection, for mounting the stem. Butterfly valve and the pipe flange connection to use more; such as use of the clip connections, the minimum length of the structure.

(2) Stem :Stem is the butterfly plate shaft, input shaft and stuffing box sealing structure to prevent media leaks. Upper stem in direct contact with the transmission, to transmit torque.

(3) Butterfly plate:Butterfly valve disc is opening and closing parts. According to the disc in the installation in the valve body, butterfly valve can be divided into the following forms:

① Centrosymmetric board : Stem fixed radial disc center hole on the stem and disc are mounted vertically

Unsealed shaped butterfly: Close sealed butterfly valve can not be guaranteed. Throttling in the pipeline can be used, typically a ring made ​​of metal.

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